"Their egg-laying, when it happens, only needs two to three days before they hatch and then you've got toadlets around," Mr Schwartzkopff said.

"[It] could be handled reasonably well, but if there's any sort of prolonged wet season down here in the centre, or if someone managed to get one in one of the waterholes out towards the east or the west, then chances are that could cause a bit of a problem with the native fish and those sorts of things out there."

However, any toad population would be impacted by the inhospitable winter months.

"As in most animals, you'll always have those that die off and a percentage that will actually survive through it," Mr Schwartzkopff said.

"That's the main concern — if they do get established, you'd most probably never be able to get rid of the lot of them."